package com.jy.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.jy.reggie.common.BaseContext;
import com.jy.reggie.common.CustomException;
import com.jy.reggie.entity.*;
import com.jy.reggie.mapper.OrderMapper;
import com.jy.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper,Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long currentId = BaseContext.getCurrentId();
        orders.setUserId(currentId);
        //获得当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(queryWrapper);

        if(shoppingCarts==null || shoppingCarts.size()==0){
            throw new CustomException("购物车为空，无法下单");
        }
        
        //查询用户数据
        User user = userService.getById(currentId);

        //查询地址数据
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());
        if(addressBook==null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //向订单表插入数据：一条
        long orderId = IdWorker.getId();//通过mp提供的Idworker生成订单id
        AtomicInteger amount = new AtomicInteger(0);//AtomicInteger是原子多线程int基本数据类型操作中不会出现多线程赋值失败错误,因为其原子性所以这里很关键

        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setId(orderId);//订单id
        orders.setNumber(String.valueOf(orderId));//订单号
        orders.setUserId(currentId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);//2代表待派送
        orders.setAmount(new BigDecimal(amount.get()));//订单总金额（BigDecimal不会损失精度）
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());//收货人
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        this.save(orders);

        //向订单明细表插入数据：多条
        orderDetailService.saveBatch(orderDetails);

        //清空购物车
        shoppingCartService.remove(queryWrapper);
    }
}